Drop rain anywhere in the world and see where it ends up

One of my favorites of the year, Sam Learner’s River Runner shows you a terrain map that lets you place a drop of rain anywhere in the contiguous United States. You’re then taken on a river tour that shows where the drop ends up. Learner just expanded the project to let you drop water anywhere in the world.

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Map shows you where a raindrop ends up

River Runner is a fun interactive map by Sam Learner. Click anywhere in the contiguous United States to drop some rain and, based on data from the U.S. Geological Survey, the map shows you where the rain ends up and the path it takes to get there.

This uses USGS NHDPlus data and their NLDI API to visualize the path of a rain droplet from any point in the contiguous United States to its end point (usually the ocean, sometimes the Great Lakes, Canada/Mexico, or another inland water feature). It’ll find the closest river/stream flowline coordinate to a click/search and then animate along that flowline’s downstream path.

When you think about it, it’s kind of nutty that something like this is even possible. [via Waxy]

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